Core drill



sept. 13, 193s. J, B. NEW/SSM 2,130,192 i CORE DRILL Filed July 9, 1957 FILE-l... Q Q f f, f f

f4* INVENTOR. Z /0/7/7 5mm/7er Nen/50m BY "fr 7?- 0* ATTORNEY Patented Sept. 13, 1938 UNITED STATES -PATENT OFFICE comi. DRILL San Francisco, Calif.,

a corporation of Nevada Application July s, 1937, serial No. 152,027

3 Claims.

This invention relates to coredrills and in particular to a core drill for straightening drilled shafts or bores.

Under some conditions a drilled shaft will turn olf slightly from the vertical. In Vertical shafts closely controlled by surveys, this is of course an extremely serious objection.

The object of this invention is'the provision of a core drill which may be maintained in a centered position with respect to a vertical line while it is being rotated in order to straighten the shaft.

More specifically, the object of this invention is the provision of an upwardly converging core drill adapted to be aligned Within a drilled shaft or bore and secured to the main drive shaft by means of toggle joints.

'I'he invention possesses other advantageous features, some of which with the foregoing will be set forth at length in the following description where that form of the invention which has been selected for illustration in the drawing accompanying and forming a part of the present specification is outlined in full. In said drawing, one form of the invention is shown, but it is to be understood that it is not limited to such form, since the invention as set forth in the claims may be embodied in a plurality of forms.

Referring to the drawing:

Figure 1 is a Vertical section taken through a core drill embodying the objects of my invention, in its operative position within a drilled shaft or bore which has turned off slightly from the vertical.

Figure 2 is a section taken on the line 2-2 of Figure 1.

As shown in Figure 1, the object of my invention may be embodied in a core drill comprising an upwardly converging core barrel I provided at its lower end with a cutting shoe 2 and secured at its upper end to a downwardly flanged ring 3. Welded to the under side of the flanged ring 3 are a pair of spaced angle irons 4 l extending parallel to a diameter of the ring 3. 45 Secured to and supported by the angle irons 4 is a ring 5 which in turn is secured to or made integral with a sleeve 6. Snugly disposed within the sleeve 6 is a core drill shaft I which may be vsecured to the sleeve 6 by a bolt 8 passing through the shaft l', the sleeve 6, and a flanged ring 49. Also supported on the downwardly anged ring 3 is a pair of diametrically opposed sections of angle irons II.

A centrally apertured plate I2 through which the core drill shaft 1 is adapted to pass is secured to a spider I4 by means of a hub I3. The aperture in the plate I2 should be sumciently large to permit the shaft 1 to rotate andslide easily within it. The spider I4 is provided with threaded lugs I5, and threaded in the lugs I5. are screws I6 by means of which the spider I4 and consequently the upper end of the core barrel I maybe adjusted and maintained in any predetermined aligned position within the shaft or bore Il. The upper end of the core drill shaft l is secured to the main drive shaft I8 by an intermediate shaft I9 and a pair of toggle joints 2| and 22. The main drive shaft is rotatably secured within a pilot house 23 and is adapted to be rotated by means of a motor supported therein, all as disclosed in my allowed co-pending application Serial No. 112,266 iiled November 23, 1936. A detailed description of the pilot house 23 and the operating mechanism therein contained is deemed kunnecessary in this application, for its constructioni'and operation are identical with the construction and operation of the pilot house I as shown and described in my co-pending application.

'I'he outer diameter of the drill shoe 2 should be substantially equal to the diameter of the 4shaft or core being straightened, and when designed for use in conjunction with a ve foot core drill as disclosedl in my co-pending application above referred to, this diameter should be substantially iive feet. Withy a diameter of this size, the length of the core barrel may be madev seven feet, while its upper diameter should be approximately four feet, ten inches. The width of the drill shoe should be such that the diameter of the core cut out by it is considerably less than the upper diameter of the core barrel. It should be noted that a shoe having Va width of one and one-half inches will normally cut al kerf two inches wide, and that therefore the diameter of the core cut by the shoe 2 will be somewhat smaller than the inner diameter of the shoe. When so constructed, it will be seen that the core barrel may be centered withinv the lower end of the shaft or bore Il with respect to a vertical line, and maintained in such a vertical position by means of the spider I4. 'I'he rotation of the main drive shaft I8 which of course is held in alignment with theshaft I 'I which has been 'd turned slightly from the vertical, will rotate the core barrel I so as to continue the shaft in its new true alignment. After the shaft'or bore has once been straightened, then the lcore barrel shown in my co-pending application above referred to can again be utilized for deepening the shaft in its corrected direction.

The operation of the device above described is as follows: When it is found that the shaft or bore has turned slightly off from a true vertical plane, the core barrel normally used in sinking the shaft and as disclosed in my co-pending application, is replaced by the core barrel I and its associated toggle joints as shown and described in thevpresent application. 'Ihe pilot house 23 is lowered within the shaft until the shoe 2 rests on the bottom of the shaft and is locked in place. The core barrel I is then aligned witliinthe shaft I1 by means of the spider Il so that the shaft will be continued along a true vertical line. The core barrel I and the shoe 2 are then rotated indirectly by means of the main drive shaft I8 until the core 24 formed by this operation is substantially equal in length to the length of the core barrel. The entire mechanism is then removed from the shaft in the manner disclosed in my co-pending application, the core is removed, and then the operation' is repeated until the extended length of the shaft in its new direction is of sufficient length to determine this new direction when the core barrel normally used as lshown in my co-pending application is inserted therein.

Although the mechanism above described has been shown in conjunction with turning the dircction of a vertical shaft, it obviously may bel drill drive shaft secured to the upper end of f said core drill; a spider journaled on said drive shaft for holding said shaft in a predetermined alignment within the bore to straightened; a main drive shaft; means for holding said main drive shaft in central alignment within said bore; means for rotating said main drive shaft; and an intermediate shaft connected at its'ends to said core drill drive shaft and main drive shaft by means of toggle joints.

2. A device for straightening a bore, compris ing: an upwardly converging core drill having a cutting shoe the outer diameter of which is substantially equal to the diameter of the bore to be straightened; a core drill drive shaft secured to the upper end of said core drill; a spider journaled on said drive shaft for holding said shaft in a predetermined alignment within the bore to be straightened; a main drive shaft; means fox' holding said main drive shaft in central alignment within said bore; means for rotating said main drive shaft; and an intermediate shaft connected at its ends to said core drill drive shaft and -main drive shaft by means of toggle joints.

3. A Vdevice for straightening a bore, compris-- ing: a core drill having a drill shoe of a greater diameter than any diameter taken through any other point in said drill; a core drill drive shaft secured to the upper end of, said core drill; a spider journaled on said drive shaft for holding said shaft in a predetermined alignment within the bore to be straightened; a main drive shaft; means for holding said main drive shaft in central alignment within said bore; means for rotating said main drive shaft; and an intermediate shaft connected at its ends to said core drill drive shaft and main drive shaft by means of toggle joints.

JOHN BRANNER NEWSOM. 

